Quantum Calcu-Flash S Digital Flash Meter (CFS) Measures light output from studio or portable flash units. Will read direct (incident), bounce, or fill-in flash (at 1/60 sec), multiple flash, and accumulated flash. Reflected flash, spot, fiber optic and contrast readings possible with optional accessory attachments. Blue enhanced silicon photodiode light metering cell. No corded triggering possible. Pushing a single button is all that's required to activate the meter. Memory recall of last reading. Digital display: two digit LED numerals representing light value in 1/3 EV sequence of 01 to 24. Dial shows proper f/stop setting opposite EV number scale. Display stays on for only a few seconds to conserve battery life; pressing memory button will bring display back. Supplied NEW with incident flash turret (Hi and Lo), neck strap. Light measuring angle : 180 incident, 30 reflected. Flash measuring range: ASA 100, incident flash: f/1.4 - f/91 ASA range: 0.8 to 50,000 Batteries: MS76 Size: 4x2.75x1.1 in. Weight: 4.5 oz. Quantum Meters Optional Accessories: SX-1 10 Degree Spot Attachment, DX-1 Flat Diffuser, FOX-1 1" Fiber Optic Probe, SDX Swivel Studio Dome, DX-2 Diffuser/Enlarging Attachment, FOX-2 12" Flexible Fiber Optic Probe, MX-1 Microscope Attachment, HC-1 Hard Case CL/CF, FTS Flash Trigger Switch, CFC Calcu-Flash Replacement Sync Cord. New Open Box